Blue whales are found back at South Georgia

Assembled from 49 blocks · 1 evidence · 48 related

1. Story
2. A survey combining visual line transects with directional sonobuoy deployments records 58 blue whale sightings from 2,430 km of visual effort, with 23 individuals photo-identified. Between 1998 and 2018 more than 34,000 km of systematic effort had produced one sighting. Since 2018 both sightings and acoustic detections have increased. Fifty years after the whaling ended, the animals are using the ground again.
3. Knowledge
4. Antarctic Blue Whale (B. m. intermedia)
5. South Georgia
6. Passive Acoustic Monitoring Arrays
7. Photo-Identification Cataloguing
8. Blue whales are found back at South Georgia
9. Connections
10. South Georgia
11. Antarctic Blue Whale (B. m. intermedia)
12. Photo-Identification Cataloguing
13. Passive Acoustic Monitoring Arrays
14. Antarctic Summer Feeding Migration
15. Southern Ocean
16. Grytviken Whaling Station
17. Whaling begins at Grytviken, South Georgia
18. Whaling ends at South Georgia
19. Blue whales are found back at South Georgia
20. An individual Antarctic blue whale is re-sighted at South Georgia
21. Southern Ocean
22. Blue Whale (Balaenoptera musculus)
23. IWC Southern Ocean Research Partnership
24. Commission for the Conservation of Antarctic Marine Living Resources
25. Whaling begins at Grytviken, South Georgia
26. The Antarctic blue whale catch reaches its all-time peak
27. The heaviest blue whale on record is weighed
28. Soviet fleets take protected whales and file false returns
29. The IWC protects blue whales from commercial hunting
30. Whaling ends at South Georgia
31. The commercial whaling moratorium takes effect
32. Dedicated Antarctic Blue Whale Project voyages
33. Blue whales are found back at South Georgia
34. The only published Antarctic blue whale satellite tracks are released as data
35. A capture-recapture abundance estimate for Antarctic blue whales is published
36. An individual Antarctic blue whale is re-sighted at South Georgia
37. IWC Southern Ocean Research Partnership
38. Dedicated Antarctic Blue Whale Project voyages
39. Blue whales are found back at South Georgia
40. A capture-recapture abundance estimate for Antarctic blue whales is published
41. An individual Antarctic blue whale is re-sighted at South Georgia
42. Antarctic Summer Feeding Migration
43. IWC Southern Ocean Research Partnership
44. The 52 Hz call is identified in Navy hydrophone data
45. The SOSUS mission is declassified
46. Blue whale song frequencies are observed falling worldwide
47. Blue whales are found back at South Georgia
48. Evidence
49. Industrial whaling off South Georgia between 1904 and 1971 killed 42,698 blue whales there; more than 34,000 km of systematic survey between 1998 and 2018 produced only a single blue whale sighting; a 2020 survey using visual line transects and DIFAR sonobuoys produced 58 blue whale sightings from 2,430 km of visual effort with 23 individuals photo-identified, and 41 individuals were photo-identified from South Georgia in total between 2011 and 2020. V55 verification basis: these figures were returned in the search result carrying the journal abstract and attributed to this paper.